Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 395 · 40 questions

The fast method (One-step multiplier): Increase by p%: multiply by (100 + p)% — up 20% is × 1.2. Decrease by p%: multiply by (100 − p)% — down 25% is × 0.75. Easy way to multiply: × the whole number (115 or 75), then ÷ 100.

1. 1.100 decreased by 5% =
2. 2.780 increased by 5% =
3. 3.525 decreased by 60% =
4. 4.160 decreased by 5% =
5. 5.520 decreased by 15% =
6. 6.360 decreased by 75% =
7. 7.210 decreased by 40% =
8. 8.690 increased by 20% =
9. 9.630 increased by 20% =
10. 10.470 increased by 30% =
11. 11.300 increased by 5% =
12. 12.504 increased by 75% =
13. 13.540 increased by 5% =
14. 14.705 decreased by 20% =
15. 15.45 decreased by 40% =
16. 16.535 decreased by 20% =
17. 17.175 increased by 8% =
18. 18.240 decreased by 10% =
19. 19.296 decreased by 75% =
20. 20.460 increased by 30% =
21. 21.640 increased by 40% =
22. 22.94 decreased by 50% =
23. 23.100 increased by 60% =
24. 24.688 increased by 75% =
25. 25.140 increased by 15% =
26. 26.160 decreased by 30% =
27. 27.460 increased by 10% =
28. 28.675 increased by 8% =
29. 29.640 increased by 35% =
30. 30.100 decreased by 10% =
31. 31.420 decreased by 15% =
32. 32.220 increased by 30% =
33. 33.100 decreased by 15% =
34. 34.65 decreased by 60% =
35. 35.788 increased by 75% =
36. 36.100 decreased by 8% =
37. 37.648 decreased by 75% =
38. 38.136 increased by 50% =
39. 39.160 decreased by 10% =
40. 40.744 decreased by 75% =

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